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Ensure peer_disconnected is called after a handler refuses a connection #3580

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Feb 9, 2025
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Ensure peer_disconnected is called after a handler refuses a connection #3580

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9737a01
Call `peer_disconnected` after a handler refuses a connection
TheBlueMatt Jan 30, 2025
07148db
Add `RoutingMessageHandler::peer_disconnected`
TheBlueMatt Jan 30, 2025
4bc597a
Assert `peer_{dis,}connected` consistency across test handlers
TheBlueMatt Jan 30, 2025
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1 change: 1 addition & 0 deletions lightning-net-tokio/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -689,6 +689,7 @@ mod tests {
) -> Result<(), ()> {
Ok(())
}
fn peer_disconnected(&self, _their_node_id: PublicKey) {}
fn handle_reply_channel_range(
&self, _their_node_id: PublicKey, _msg: ReplyChannelRange,
) -> Result<(), LightningError> {
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8 changes: 8 additions & 0 deletions lightning/src/ln/msgs.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1578,6 +1578,8 @@ pub trait ChannelMessageHandler : MessageSendEventsProvider {
/// May return an `Err(())` if the features the peer supports are not sufficient to communicate
/// with us. Implementors should be somewhat conservative about doing so, however, as other
/// message handlers may still wish to communicate with this peer.
///
/// [`Self::peer_disconnected`] will not be called if `Err(())` is returned.
fn peer_connected(&self, their_node_id: PublicKey, msg: &Init, inbound: bool) -> Result<(), ()>;
/// Handle an incoming `channel_reestablish` message from the given peer.
fn handle_channel_reestablish(&self, their_node_id: PublicKey, msg: &ChannelReestablish);
Expand Down Expand Up @@ -1656,7 +1658,11 @@ pub trait RoutingMessageHandler : MessageSendEventsProvider {
/// May return an `Err(())` if the features the peer supports are not sufficient to communicate
/// with us. Implementors should be somewhat conservative about doing so, however, as other
/// message handlers may still wish to communicate with this peer.
///
/// [`Self::peer_disconnected`] will not be called if `Err(())` is returned.
fn peer_connected(&self, their_node_id: PublicKey, init: &Init, inbound: bool) -> Result<(), ()>;
/// Indicates a connection to the peer failed/an existing connection was lost.
fn peer_disconnected(&self, their_node_id: PublicKey);
/// Handles the reply of a query we initiated to learn about channels
/// for a given range of blocks. We can expect to receive one or more
/// replies to a single query.
Expand Down Expand Up @@ -1707,6 +1713,8 @@ pub trait OnionMessageHandler {
/// May return an `Err(())` if the features the peer supports are not sufficient to communicate
/// with us. Implementors should be somewhat conservative about doing so, however, as other
/// message handlers may still wish to communicate with this peer.
///
/// [`Self::peer_disconnected`] will not be called if `Err(())` is returned.
fn peer_connected(&self, their_node_id: PublicKey, init: &Init, inbound: bool) -> Result<(), ()>;

/// Indicates a connection to the peer failed/an existing connection was lost. Allows handlers to
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11 changes: 11 additions & 0 deletions lightning/src/ln/peer_handler.rs
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Should we enforce uniformity going forward by having the respective handler interfaces inherit from a general trait PeerMessageHandler interface and move peer_{connected, disconnected} and provided_{node,init}_features to it?

Note this would also allow us to iterate over all previously-succeeded handlers rather than having to call them individually (which might get stale at some point in the future).

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Yea, we should definitely require uniformity going forward. We could definitely do a higer-level interface, do you want it in this PR or when we add the next handler?

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We could definitely do a higer-level interface, do you want it in this PR or when we add the next handler?

I'd have a slight preference to do it right away, but feel free to do in a follow-up if you'd rather land this quickly.

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I wrote the patch, but its 36 files changed, 982 insertions(+), 1018 deletions(-), so kinda would prefer to split it up just for sanity.

Original file line number Diff line number Diff line change
Expand Up @@ -88,6 +88,8 @@ pub trait CustomMessageHandler: wire::CustomMessageReader {
/// May return an `Err(())` if the features the peer supports are not sufficient to communicate
/// with us. Implementors should be somewhat conservative about doing so, however, as other
/// message handlers may still wish to communicate with this peer.
///
/// [`Self::peer_disconnected`] will not be called if `Err(())` is returned.
fn peer_connected(&self, their_node_id: PublicKey, msg: &Init, inbound: bool) -> Result<(), ()>;

/// Gets the node feature flags which this handler itself supports. All available handlers are
Expand Down Expand Up @@ -119,6 +121,7 @@ impl RoutingMessageHandler for IgnoringMessageHandler {
Option<(msgs::ChannelAnnouncement, Option<msgs::ChannelUpdate>, Option<msgs::ChannelUpdate>)> { None }
fn get_next_node_announcement(&self, _starting_point: Option<&NodeId>) -> Option<msgs::NodeAnnouncement> { None }
fn peer_connected(&self, _their_node_id: PublicKey, _init: &msgs::Init, _inbound: bool) -> Result<(), ()> { Ok(()) }
fn peer_disconnected(&self, _their_node_id: PublicKey) { }
fn handle_reply_channel_range(&self, _their_node_id: PublicKey, _msg: msgs::ReplyChannelRange) -> Result<(), LightningError> { Ok(()) }
fn handle_reply_short_channel_ids_end(&self, _their_node_id: PublicKey, _msg: msgs::ReplyShortChannelIdsEnd) -> Result<(), LightningError> { Ok(()) }
fn handle_query_channel_range(&self, _their_node_id: PublicKey, _msg: msgs::QueryChannelRange) -> Result<(), LightningError> { Ok(()) }
Expand Down Expand Up @@ -1714,14 +1717,20 @@ impl<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, OM: Deref, L: Deref, CM
}
if let Err(()) = self.message_handler.chan_handler.peer_connected(their_node_id, &msg, peer_lock.inbound_connection) {
log_debug!(logger, "Channel Handler decided we couldn't communicate with peer {}", log_pubkey!(their_node_id));
self.message_handler.route_handler.peer_disconnected(their_node_id);
return Err(PeerHandleError { }.into());
}
if let Err(()) = self.message_handler.onion_message_handler.peer_connected(their_node_id, &msg, peer_lock.inbound_connection) {
log_debug!(logger, "Onion Message Handler decided we couldn't communicate with peer {}", log_pubkey!(their_node_id));
self.message_handler.route_handler.peer_disconnected(their_node_id);
self.message_handler.chan_handler.peer_disconnected(their_node_id);
return Err(PeerHandleError { }.into());
}
if let Err(()) = self.message_handler.custom_message_handler.peer_connected(their_node_id, &msg, peer_lock.inbound_connection) {
log_debug!(logger, "Custom Message Handler decided we couldn't communicate with peer {}", log_pubkey!(their_node_id));
self.message_handler.route_handler.peer_disconnected(their_node_id);
self.message_handler.chan_handler.peer_disconnected(their_node_id);
self.message_handler.onion_message_handler.peer_disconnected(their_node_id);
return Err(PeerHandleError { }.into());
}

Expand Down Expand Up @@ -2533,6 +2542,7 @@ impl<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, OM: Deref, L: Deref, CM
debug_assert!(peer.their_node_id.is_some());
if let Some((node_id, _)) = peer.their_node_id {
log_trace!(WithContext::from(&self.logger, Some(node_id), None, None), "Disconnecting peer with id {} due to {}", node_id, reason);
self.message_handler.route_handler.peer_disconnected(node_id);
self.message_handler.chan_handler.peer_disconnected(node_id);
self.message_handler.onion_message_handler.peer_disconnected(node_id);
self.message_handler.custom_message_handler.peer_disconnected(node_id);
Expand All @@ -2557,6 +2567,7 @@ impl<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, OM: Deref, L: Deref, CM
let removed = self.node_id_to_descriptor.lock().unwrap().remove(&node_id);
debug_assert!(removed.is_some(), "descriptor maps should be consistent");
if !peer.handshake_complete() { return; }
self.message_handler.route_handler.peer_disconnected(node_id);
self.message_handler.chan_handler.peer_disconnected(node_id);
self.message_handler.onion_message_handler.peer_disconnected(node_id);
self.message_handler.custom_message_handler.peer_disconnected(node_id);
Expand Down
2 changes: 2 additions & 0 deletions lightning/src/routing/gossip.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -701,6 +701,8 @@ where
Ok(())
}

fn peer_disconnected(&self, _their_node_id: PublicKey) {}

fn handle_reply_channel_range(
&self, _their_node_id: PublicKey, _msg: ReplyChannelRange,
) -> Result<(), LightningError> {
Expand Down
2 changes: 2 additions & 0 deletions lightning/src/util/test_utils.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1245,6 +1245,8 @@ impl msgs::RoutingMessageHandler for TestRoutingMessageHandler {
Ok(())
}

fn peer_disconnected(&self, _their_node_id: PublicKey) {}

fn handle_reply_channel_range(
&self, _their_node_id: PublicKey, _msg: msgs::ReplyChannelRange,
) -> Result<(), msgs::LightningError> {
Expand Down